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Gardening in Washington State

Acetic acid/vinegar as pesticide ingredients

Acetic acid is one of the few chemicals with two common names. Both depend upon its concentration. “Vinegar” means concentrations up to 8%. “Acetic acid” means concentrations higher than 8%. When the concentration is low enough to be called vinegar, it is a food product. When the concentration is high enough to be called acetic acid, and it is used to kill weeds, it is a pesticide. The point to remember with acetic acid is that high concentrations are more effective on woody perennial weeds, while low concentrations will work effectively only on very young weed seedlings.

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For more information on using acetic acid/vinegar as a pesticide, see WSU FS161E.

Submitted by: Catherine Daniels, March 9, 2015

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